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Acquisitions - Additional Information (Details)
£ in Millions, $ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Acquisition   $ 193    
Goodwill   3,941   $ 3,900
Arena Group, Altodigital Networks and ITEC Connect        
Business Acquisition [Line Items]        
Acquisition £ 132 $ 171    
Arena Group        
Business Acquisition [Line Items]        
Percentage of ownership acquired   100.00%    
Altodigital Networks        
Business Acquisition [Line Items]        
Percentage of ownership acquired   100.00%    
ITEC Connect        
Business Acquisition [Line Items]        
Percentage of ownership acquired   100.00%    
Digitex Canada        
Business Acquisition [Line Items]        
Acquisition   $ 22 $ 29  
Percentage of ownership acquired   100.00%    
2020 Acquisitions        
Business Acquisition [Line Items]        
Intangible assets   $ 70    
Goodwill   105    
Miscellaneous Banks | Bridge Loan | HP Inc.        
Business Acquisition [Line Items]        
Amount committed by lender   $ 24,000